Maintenance Rule

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Maintenance Rule (MR), from 10 CFR 50.65,"Monitoring the Effectiveness of Maintenance at Nuclear Power Plants."

Guidance Documents

Regulatory guides for the maintenance rule are --

  • Regulatory Guide 1.160, Revision 3 , "Monitoring the Effectiveness of Maintenance at Nuclear Power Plants," is the current revision of the regulatory guide that provides one acceptable method for implementing the maintenance rule. The regulatory guide endorses NUMARC 93-01, Revision 4A.
  • NUMARC 93-01, Revision 4A ,"Industry Guideline for Monitoring the Effectiveness of Maintenance at Nuclear Power Plants," is the currently endorsed version of the industry guidance document developed by the Nuclear Utilities Management and Resource Council, now the Nuclear Energy Institute (NEI).


Maintenance Rule Functional Failure (MRFF)